Liquid recoil-brake for guns.



K. VULLBR.

LIQUID REGOIL BRAKE FOB GUNS.

APPLIUATION FILED JAN. 11, 1908.

Patented May 28, 1912.

Brakes for Guns; and

the following to be a full, clear, and exact inder, so that it isrotated UNITE STA s rrnr or en- KARL venue, or nussnnnonr, GERMANY,

ASSIGNOR.T0 RHEINISCH E METALL- LIQUID RECOIL-BRAKE FOR GUNS.

Specification of Letters Patent.

Application filed January 11, 1908. Serial No. 410,415.

To all whom it may concern:

Be it known that I, KARL neer, a subject of the German Em eror, residingat 17 Jiilicherstrasse, Dusseldorf, Germany, have invented certain newand useful Improvements in Liquid Recoil- I do hereby declare VOLLER,engidescription of the invention, such as will enable others skilled inthe art to which it appertains to, make and use the same.

The present invention relates to recoil brakes for guns wherein thecross sectional area of the passage for the fluid is controlled duringthe recoil by two valve parts situated opposite each other and rotatingrelatively to each other, in opposite directions so as gradually toclose the passage. To effect this one part of the valve is fixed to thepiston rod so that it can not rotate while the other has guide filletsor lugs en gaging in helical" grooves in the brake cylduring the recoil.Since the pressure exerted by the brake liquid during recoil is veryhigh the partsof the valve are in the valves as heretofore constructedfirmly pressed together so that on the one hand the non-rotatingpartretards therotat-ion of the other part, and there is great frictionbetween the parts entailing a corresponding effect on the guidingfillets and grooves and affecting the ac curacy of their fit, while onthe other hand the rotary part tends to rotate the non-rotating part andso exerts a torsion on the piston rod; moreover, there is much wearowing to the friction between the parts.

The present invention purposes to remove these objections by causing theliquid pressure in the axial direction to be borne by the non-rotatingpart and thereby transmitted to the piston rod, and by leaving betweenthe relatively moving suriaces of the valve parts a space, which isltept so small that the liquid is very strongly throttled and thereforethe pressure of the liquid is not transmitted between these surfaces.

In the accompanying drawings Figures 1 and 2 show the application of theinven tion to a brake wherein the rotating part of the valve is behindthe non-rotating part in the direction of the pressure. Figs. 3

and 4 show a brake wherein. the rotating part-is infront of theHGIPiOt-tlilfig part.

Figs. 1 and 3 being longitudinal sections and Figs. 2 and 4 crosssections.

In Figs. 1 and 2, a is the piston rod connected in the usual manner withthe cradle;

on this rod is mounted the piston Z) which is free to rotate, but isheld against axial movement by the nut, c, on the end of the PatentedMay 28,1912.

pistonrod, a, bearing against the front side of'the piston and a dividedring, 03, fitted in an annular groove in the piston rod and engaging therear side of the piston. On the recoil of the brake cylinder e which isfixed to the gun barrel, the piston b is rotated owing to the engagementof fillets or lugs on the outer side thereof in the helical grooves fofthe brake cylinder. The valve plate g which controls the passage ofthe brake liquid during the recoil, is mounted on the piston rod on soas to be axially movable but incapable of rotation. The whole pressureof the fluid acts on this plate in the direction. of the arrow in Fig.1, during the recoil. The valve plate 9 is constructed with a circulargroove in its front face which receives the ring (Z. The width of thisring, (Z, exceeds the combined depth of its seats in the piston and thevalve plate so that a small space, in, will be left between the adjacenti'aCes of the said plate and the piston so that there can be nofrictional contact between these surfaces and transmission of the fluidpressure between the same is impossible. In this manner the greater partot'thc axial pressure is transmitted from valve 9' to piston rod a andthe piston b practically completely relieved of pressure. I

in Figs. 3 and 4: an example is shown wherein unlike the previous case,the fluid pressure does not act on the non-rotating part but on therotary part placed in front of the latter. This requires a separaterelieving disk which during the. recoil-lies in front of the rotary partof the valve, leaving a small space. In these figures 71 is the pistonrod fixed to the cradle and provided with the enlarged head 2'. ()n thisenlarged head is a sleeve A, free to slide and to rotate. The axialmovement of the sleeve is limited in one direction by the shoulder Z onthe piston rod 7). and in the other direction by a stop or plug, .9,screwed into the front end of the sleeve l1, so that the latter can moveaxially through the distance y indicated be- I, the piston fro-'1 erwedfrom the en- COll T0111 the rotating s inserted in the latter ed thering 9'. The {US- W tunee between he flange oi: the bush g) and the ring9 is somewhat greater than depth 7' of the shoulder in the sleeve i0 sothat there is it small spate which prevents the tniinsmission thepressure between the snyfeces. .3 1e pressure acting on the free surfaceoi ring g and bush 3, during retoit is transmit-teal by the bush 3) tothe front face m of the head 2', While the sleeve is is relieved ofpressure. This latter only affected by the pressure exerted Within thesmall cylindrical segments between the ring: 7 and the brake cylinder 0,shown cross imtched in Fig,

The invention can also he appliecl to other hzfztke pistonconsti'uctions in which the (101!- 4 see equivalent to thosectescribecli g now particularly described e (l aimed the nature of mysaid invention prising val e for controllin the flow of the britt eliqoicl consisting 03; a rotatable .1 totnble pert arranged to coact oand means 0 hotel said parts constantly out 17 of contact.

In a liqmd reoozl brake for guns, the

combination of a valve member mounted to slide out incapable ofrotation, a valve member mounted to rotate out incapable of axialmovement, and a spacing ring srrongetl to preventcontnct between thesaid members.

The combination of the piston rod, a rotatable piston mounted on thepiston rod, a slidable Yalve plate mounted on the piston rotl adjacentthe end of the piston, and a spacing ring seated in the piston rod antiengaging the opposetl faces of the piston and the valve plate to holdthem out of Contact.

1 testimony whereof I have hereunto afmy signature in the presence oftwo KARL VoLLER.

